[Q]Strange behavior in reading Compact Flash card

Dear all,

I am having a problem when I try to read CF card. I am using an ARM7
and the CF card is in Memory Mapping mode with 16-bit data bus width.
From the CF specification 4.0, it said that to access the data
register in CF card, pull down -CE1 and -CE2, and the 512 bytes can be
read out consecutively. But when I tried to do this, every second read
is the same as its previous read such like


Correct one : B0 B1 B2 B3 B4 B5 ......
What I got : B0 B1 B0 B1 B2 B3 B2 B3 ....

So I have to read twice and discard one of them to obtain the correct
data. The CF card I am using is Transcend 512MB, I haven't tested
Sandisk's.

Does anybody experience the same thing? Thanks.

.